It's normal procedure from Rule 32(c) of the Federal Rules of Criminal Procedure.
(c) Presentence Investigation.
(1) Required Investigation.
(A) In General. The probation officer must conduct a presentence investigation and submit a report to the court before it imposes sentence unless:
(i) 18 U.S.C. §3593 (c) or another statute requires otherwise; or
(ii) the court finds that the information in the record enables it to meaningfully exercise its sentencing authority under 18 U.S.C. §3553, and the court explains its finding on the record.
(B) Restitution. If the law permits restitution, the probation officer must conduct an investigation and submit a report that contains sufficient information for the court to order restitution.
(2) Interviewing the Defendant. The probation officer who interviews a defendant as part of a presentence investigation must, on request, give the defendant's attorney notice and a reasonable opportunity to attend the interview.